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TARRAGONA, SPAIN - OCTOBER 07: Members of the Colla 'Caprogossos de Mataro' climb up as they construct a human tower during the 24th Tarragona Castells Comptetion on October 7, 2012 in Tarragona, Spain. The 'Castellers' who build the human towers with precise techniques compete in groups, known as 'colles', at local festivals with aim to build the highest and most complex human tower. The Catalan tradition is believed to have originated from human towers built at the end of the 18th century by dance groups and is part of the Catalan culture. (Photo by David Ramos/Getty Images)